Two stage hammer mill



July 7, 1953 w. w. wEsT Two STAGE.' HMM/1ER MILL Filed June 8, 1951 IN VEN TOR. Waco/fo h//r v Arm/,wir

Patented July 7, 1953 n 2,644,644I

UNITED STATE-s PATENT oFFlcEi- Woodrow W. `West, BosemontfPassassignor Pennsylvania Crusher Company, Philadelphia Pa.;a corporation of New Yo'jl Application time. s, 1951, `serial No. 239,622

4 claims. (el. 2,411. 1.54)?, l

This invention relates to an impact type crush? the :right hand sidel ofthecycle ofrotation asp er and more particularly to the multiple impact` can-abe.v s enen1 :fnY thedrawing-.` The, yparticles.are crushing of frangible material by a plurality of thus-thrownfagain'stjimpact plates '2l-:immediat separately rotating sets of rotating hammers. lyadjacent \t( fsc0`1;l1d` rotor from Whichthy falli.l

An objectof the invention is to provide a 5 throughydischarge opening laandgutyofhegw crushing machine that reduces frangiblemaf cru li-a1ngv 7, L telal by m1133019- The fr tors I3-and ware positioned: and spaced?,

Another object ofthe invention is to reduce `so ythatf.;the.hammers,turn;free;- ofr oneanoth Y frangible material to'the desiredv size by rotat-l and the lfiarvnmer;.circlesrdo;not;inteisegt;}. \;y1?h1; ing jhammers hitting the 'material repeatedlypmleacliotherzthus vwthe hammerswzzyiapd zaswmg against breaker surfaces. freely, i The .rotorv I6 isipositioned belgwandqf Another object vof theinvention is to provide theA rig.1fi t .pfthe-`r rotor.. 13j so thatsthegm 'tl-,jah a machine that may be` readily adjusted to acfrom chamber.. I4 drops, into thelhammerc'irclel. commodate different typescof incoming material of Athe; rotorl... Though@ they do'not .ini'ersec'ztfV andl reduce it tor different desired sizes. 15- they hammercircles.. may. overlap. sl'ightl'ywin the'.

Other and further objects and advantages will' verticalplane..l1n thehorizontalplanethetharn-Q be understood lfrom the following description` mercirclesmayoverlap eveny more. taken in connection with the Vaccompanying The rotor I3 islkeyed, tol'a drive. Ashaft24 and'.v drawing. has va pluralityofsets of .hammers 22.` which may,l

A crushing machine, as embodied in this 20 be rigidly secured'to discs 26 as shown orfo'f,.j inventionv is shown in the drawing, comprising .c the, free swinging type.v This construction ,may an outer supporting casing Ill with a feed openbe of conventional design.. The rotoruisposia ing II andan exit opening I8. A feed chute, tionedcnearithe entrance chute' I2 .and,.has..its. I2 in the feed opening II delivers materialto center' below the. end. l2IA of the deliver-y.. 'slideL-L an initial impact rotor, I3 havinghammers 22' 25 Thematerialgcoming.off the slildelzig hit'byg'lj within a breaker chamber I4 inthe casing, I0 thehammer'sgnlafter the hammers. have"passed.;

crushing the material against the walls.. An out-v above the "centerilevel of the 'rotor. ,The dritt-21j.,y put impact rotor I6 having hammers 23 and posiA t1psw25 of thehammers. 22 describea hammer.- i tioned in a breaker chamber I1 receives the ma,- circljeupon rotation `of the rotoigISjv vThe; biak'er1 terial from the impact chamber` I4 furtherv` crushsurfaces I`," vSII )are spaced fromthiscir'clegat ing vit. The crushed material drops' through 30distanceapproximately equahtof'the 'radius of@ exit opening I8 in the bottom of the casing I0 th' hammercircle. Breaker -surfaces 3I and] 34H1: beneath the rotor I6. Impact plates |9 areA 0f impactplates 19 are positioned vabove th.. mounted on the casing I0 forming the upper hammersx22'and-they Curve 'downwardly fwith side of the chamber I4 opposite to the rotor I3, a lower portion-j closer to the hammersjth and breaker plates 2l are mounted on the casing 35 the upprbreakgfvsurface 3|t0 forma bhw rg I0 forming a side to the breaker chamber I'I ing breakei-liamber14-- Thdelw'I-.yas 1e-.12s opposite the rotor I6. It is a feature of this isset atfananglefto the.,horizontak` The-Slides.' invention that the rotors I3 and I6' rotatev in' is kadjustableandy may be setat.'differentangle@` the same direction in a clockwise direction as landthe''emi' '2q-may be vrasedand,lowreds fr; shown in the drawing. The incoming material .40"th'at the speed and angle. 0f entrance'fof thief slides into the machine from the delivery slideY incoming [material into the crushe'rmay b'variedff I2 at the top of the left side and is initially hit andthejPQSlOIl and they place Whrefit enters. by the hammers 22 on the rotor I3 and rsmashed the 'peripheryjof'jthe rotatinghamnjers Assm. against the impact plates I9. Some of `thefraglarly'varied. f' i ments from this fracture of ther material may ,45'1 The slide l2 vis mounted on a pivoI-,fz-#near thedrop downward toward the second rotorl I6 where. end" *2'1"*Y and-adjustab-ly supported; by ,the @gnk they are struck by hammers 23 and` impacted 3Un d"1'ever33-attheother endn Byturning the; against the impact platesl I. Other of the, parcrank"30-th`evangle ofA the'slide maybchanged. ticles striking the` impact plates I9 rebound into rThej-pivotZB* is mounted on the vertically'v ad t the path of the hammers 22 of the rst rotor 50"ju'stable'pedestalarsupportedbylthe. legs' 'we and are struck before delivery to the4 hammers threaded in the-'beamY 49;] The pedestal may beij 23 of the second rotor. The particles impacted" raised for lowered to position the edgeh Theragainst impact plates 2| substantially alljre J material drops frommehopperA-pomothe chute., bound and are struck by thehammers 23" of the l2 and slides into the rotating1193111113342iv second rotor in theirv downward vmovement of 55A` Theomateriallfslidingolftheedge"-Z'Iiishit'iby kl duced material and the desired resulting product.

The rotor I6 is keyed on the drive shaft 36 and; f'

has a plurality of sets of hammers 23 mounted on discs 31. The hammers 2 3 are of vthe swing-iY :g

ing type hammers pivotally mounted'on the pins '38 extending through the discs 31 in a conven tional manner.

The material is initially hit by periphery of the hammers 23. The. material hitting surfaces 39 drops back into the peripheryof the hammers 23 `and is hit again by the hamthe hanclmersal 4 the walls and the hammers, as the material progresses through the machine, increases the number of blows as the material becomes ner and the number of pieces increases so that each small piece will be hit.

Larger pieces of material may be introduced into the crusher,- and broken to smaller sized piecesthan has been heretofore possible.` With the rotors independent, their speed may be separately adjusted depending on the type of intro- As it is-readily apparent that various modications may b e made in the above described emb odiment it is intended that the scope of this inventionb'e Vlimited only by the appended claims.

' Y. l1.*1Anlimpactcrusher comprising a first impact 1 vrotor having rotatable hammers providing an 23 of the second rotor I6v moving through the mers23 ata point below the breaker plates 39 and smashed against :breaker s'urfaces4l of the plates'2I. Further crushing may occur between the hammers and breaker surfaces 42 below breaker surfaces 4I. The crushed material then drops out through the exit chute opening I8.v

The breaker surfaces 39 are closer to the hammers 23 than the breaker surfaces 3| are to the hammers 22. The breaker surfaces 4I and 42 are even closer to the periphery of the hammers 23l narrowing the passage through the machine and reducing the distance between the plates and hammers.

The breaker plates I9 and 2| are held in position by the stubs 43 extending through the cas ing and wedges 44 driven through openings in the vThe side or end walls of the casing` are linea.,

with plates 45 to protect the end Walls of the cas# ing. Around the top and side walls of the deliv` ery chute are plates 46 to protect the walls of the casing.

The beam 49 closes the breaking chamber be V low the'chute I2. A sheet metal piece 5| is po-AY sitioned'at a slant betweenV the beam 49 and the opening |8 yand is rigidly fastened to the beam 49j and the angle 52 forming an edge Vof the opening.' Material caught or carried in back ofthe hammers slides down this piece and falls out through the opening. There is no tramp iron pocket.l Any unbreakable material passes through the Crusher andout the opening I8. With the rotors turning clockwise and downward there is no tendency of tramp iron to become trapped or jammed Y in the machine.

coYV

"in which the hammers are moving upwardly From the foregoing description it is s'een that I6. 'Ihe angle and height of the chute .I2 may be adjusted to properly introduce the material the rotors I3 and I6 may be set at different speeds. Rotor I3 may rotate faster or slower than rotor Y into the hammercircle of the rotor I3. These adjustments and variations will be made depend-v ing on the typeand size o f material to be reduced and the ilnal sizes desired. VThe narrowing of the breaker chamber between initialv crushing action on material introduced into the crusher and a second impact rotor having hammers rotatable? in the same direction as said rst rotor hammers, said "second rotor being in the immediate vicinity of and in open com- A munication with said rst rotor, said second rotor positioned at a lower level than said rst roltor and to the side of-a vertical planethrough the center of said first rotor to receive material subjected to the initial crushing action, means for feeding material substantially radially into the quadrant of the hammercircle of Ithe rst rotor rection to receive the impact of material from said rotors and reilecting the material into the rotating hammers, a substantially vertical extending portion of said breaker means extend# ing downwardly from said increasing vertical portion at the side of said second rotor and spaced therefrom a distance less than the spacing of said rst rotor from said horizontal portion to receive the impact of the material hit by said second rotor in the final crushing action.

2. 'An impact Crusher comprising a rst impact rotor having hammers providing an initial crushing action on material introduced into the crusher and a second impact rotor in the 'immediate vicinity 'of andin open" communication with said rst rotor and positioned at a, lower level than said rst rotor and contiguous to a vertical -zone Y through the peripheral edges ofthe first rotor hammers and to receive crushed material from said rst rotor, a feed chute positioned to feed material substantially radially into the intermediate sector ofthe quadrantV of the hammercircle above the level'of the( center of the rotor,V a breaker surface having a relatively horizontal portion' spaced above said rst rotor to'receive radially Ventering'material hit by the upwardly moving rst rotor hammers and said breaker surface' extending in 'spaced relation above said rotors in an` increasingly vertical downward direction to receive the impact of material from saidrotors and reflecting the material into the hammercircles, a substantially vertically portion of said breaker surfacebeing at the side of said` second rotor and spaced therefrom a distance less than the spacing of said rst rotor from said horif zontal portion vto receive Athe impact of the `mate f rial hit by said second rotor in the nal crushing action.

3. An impact crusher comprising a first impact rotor having rotatable hammers providing an initial crushing action on material introduced into the crusher and a second impact rotor having rotating hammers in the immediate vicinity of and in open communication with said rst rotor and positioned 'at a lower level than said rst rotor, with the second rotor and the downwardly moving hammers of said first rotor on the same sidev of a vertical zone through the center of the first rotor to receive material subjected to the initial crushing action, means for feeding material substantially radially into the quadrant of the hammercircle in which the rst'rotor hammers move upwardly above the level of the center of the rotor, a breaker wall having a relatively horizontal portion spaced above said rst rotor to receive radially entering material hit by the upwardly moving rst rotor hammers and vsaid breaker Wall extending in spaced relation above said rotors in an increasingly vertical downward direction to receive the impact of material from said rotors and reflecting the material into the rotating hammers, said second rotor rotatable in the same direction as said first rotor to hit the material against said breaker wall, a substantially vertical portion of said breaker wall being at the side of said second rotor extending downwardly from said increasing vertical portion and spaced therefrom a distance less than the spacing of said first rotor from said horizontal portion to receive the impact of the material hit by said second rotor in the nal crushing action.

4. An impact crusher comprising a rst impact rotor'having rotatable hammers providing an initial crushing action on material introduced into the crusher and a second impact rotor rotatable in the same direction as said rst rotor, said second rotor being in the immediate vicinity of and in open communication with said rst rotor to overlap said rst rotor in a horizontal zone and contiguous to a vertical zone through the peripheral edges of the rotating flrst rotor hammers to receive material subjected to the initial crushing action, an inclined feed chute positioned to feed material substantially radially into the quadrant of the -hammercircle in which the hammers are moving upwardly above the level of the center of the rotor,.a breaker Wall having a relatively horizontal portion spaced above said rst rotorv to receive radially entering material hit by the` upwardly moving first rotor hammers and said breaker wall extending in spaced relation-above said rotors in an increasingly vertical downward direction to receive the impact of material. from said rotors and reflecting the material into the rotating hammers, a substantially vertical portion of said breaker wall being at the side of said.

second rotor extending downwardly fromr said increasing vertical portion and spaced therefrom a distance less than the spacing of said first rotor from said horizontal portion to receive the impact of the material hit by said second rotor ln the nal crushing action.

WOODROW W. WEST.

References Cited n the file of this patent UNITED STATES PATENTS 

